Engine-turning gear



June 17 1924,

' MARXUS JEAN-BAPTISTE BARBAROU ENGINE TURNING GEAR Filed May 21 Marius Jean-Baptiste Barbarou IITVEZTT OR 11S Attorney.

Patented June 17, 1924.

MARIUS JEAN-BABTISTE BARIBALROU, OE YARIS, FRANCE.

ENGINE-TURNING GEAR.

Application filed May 21,

To all whom it may concern:

Be it known that I, MARIUS JEAN-BAP- TISTE BARBAROU, citizen of the French Republic, residing at Paris, in the French Republic, have invented new and useful, Improvement-s in Engine-Turning Gears, of which the, following is a specification.

The present invention has for its object an engine turning gear i. e. a device for operatively connecting a motor with an auxiliary motor or starter, in order to avoid,

at the time of engagement of the gear wheel connected to the crankshaft of the motor with the pinion of the starter, the violent shocks which might injure these parts.

The engine turning gear according to the invention comprises a spring which transmits the movement of rotation of the starter to a nut whichis combined with a screw secured to the driving pinion, the rotation of the nut causing a very slow-rotation of said screw and said pinion and a transla tion of th latter at a reduced speed for engagin it with the gerr wheelmounted on the era shaft of the engine.

Other characteristic features of the invention will appear from the following description.

tudinal axial section, and by way of example, a form of construction of the device according to the invention.

As shown in the drawing, A is the shaft of the starter, which in the case of an electric starter is the shaft of the armature. To the shaft A is keyed a bell-shaped iece B. Within the said piece B, a sleeve which is secured a disc G, is slidable with easy friction.

The sleeve E is driven by the piece B through the medium of the coil spring B. This spring by reason of the rotation of the piece B, tends to become wound on the one hand upon the said piece B, and on the other hand upon th piece C. This windin produces an energetic tightening whic causes the rotation of the sleeve E. The spring is so disposed that it acts only liy windin and not by lengthwise tension. t should be observed that the sleeve E may assume a lengthwise movement within the piece B, said translation being stopped by a washer B which is clamped between the piece B and the nut securing the latter upon the shaftA of the armature of the starter.

The inner wall of the sleeve E is screw- 1923. Serial No. 640,460.

threaded, and a screw H is screwed within said sleeve. hand, is adapted to drive the pinion F. The centering of said pinion F is ensured on the one hand by the threads of the nut E,.and on the other hand by the ball hearing T. G is the gear wheel mounted on the engine crankshaft, and S a spring which tends to hold the nut H in the position of rest.

The operation of the device is as follows: When the starter is set working, its shaft A rotates and drives the sleeve or nut E through the medium of the piece B and the spring R. But the screw H, by reason of its inertia, assumes a movement of rotation which is much slower than the rota tion of the nut E, thus producing a lengthwise movement of this screw H, which pushes the pinion F into gear engagement This screw H,on the other.

with the flywheel G mounted on the crank- 1 v the piece E and hence thepieces secured The appended drawing shows in longi-= thereto may move backward by hearing against the spring R. This translation speed is also reduced by the inertia which tends to produce a slight back motion of which position is stabilized by the action of the spring S.

It should be remarked that the pinion F is designed so as to be independent of the screw H'so that it may be readily replaced and this will thus limit the placing.

of the starter in the proper worki con ditions, to the replacing of a piece w ich is of a simple inexpensive construction.

Various constructional modifications may be obviously made in the device described without for this reason departing from the invention.

Having now described my invention, what I claim as new. and desire to secure by Letters Patent is:

In combination with the crankshaft of an engine and the shaft of a starter for said engine, a gear comprising a toothed wheel, means for operatively connecting said toothed wheel tosaid crankshaft, a" bell shaped member mounted on the end of said shaft of the starter, a nut carried and adapted to slide within said bell shaped member, a stop piece for stopping the sliding movement of said nut, a coil spring surrounding said nut and attached to said' a bell shaped member and to said nut respec- In testimony "whereof I haye signed my name to this specification.

MARIUS JEAN-BAPTISTE BARBAROU. 

